Changeable exhibitor



Oct. 13, 1925- M. W. PULLEN CHANGEABLE EXHIBITOR Filed May 12, 1922 2 Sheets-Sheet 56' Patented Oct. 13, 1925.

UNITED STATES g 1,55 ,713 PA-TENT OFFICE j MYRICK w. PULLEN, or sanrmonn, MARYLAND.

CHANGEABLE axmmoa .lpplication filed ma 12, 1922. s ndm. 560,341.

To all whom it may concern: 1 i i Be it known that I, MYRIOK W. PULLEN, a citizen of the United States,- residing at Baltimore, in the State ofMaryland, have invented certain new and useful Improve ments in Changeable Exhibitors; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the I, V I p. I I My invention elates to changeable 'ex hibitors. 'j I f Q Among the objects of my invention are To provide an exhibitor capable of exhibiting predetermined numbers, combinations of numbers}, or legends ,for a predetermined period of time. i

To provide an exhibitor capable of extremely rapid changes of the subject matter exhibited combined with means for varying at will or in a predetermined manner the'period of time during which the subject matter is exhibited. These and further objects of my inven tion'will be set forth in the following specification, reference being had to the accompanying drawings and the means by which said. objects are eifeotuated will be definitely set forth in theclaims; I

In the drawings Figure 1 is a side view of my improved exhibitor. v

Fig. 2 is a partial view of thefront of my improved exhibitor viewed in the direction of the arrow 2 in Fig. 1. Y v f Fig. 3 is a view of the. parts shown in Fig. 1 when viewed in ,the direction of the arrow 3 in said figure, the parts 51 and 51? being omitted. Fig.4 is a section along the line 4-4 1n Fig. 1, enlarged, looking in the direction of the arrows v 5 Fig. 5 is an enlarged section alongthe line 5-5 in Fig. 1 looking in the direction of the arrows. Fig. 6 is afront view of thecircuit closer for controlling my improved exhibitor.

F ig.'7' is a view of the parts shown in Fig. 6 looking in the direction of the arrow 7'in saidfigure- '.Fig. 8 is adiagram of connections.

In the'drawings:-" i g f 10 represents a drum, provided with pintlesflrevolubly .mounted in the bearings 11 -11 and the latter are supported upon the base'12: At the front of the machine the face 13 ;is mounted upon the base 12 and the former is provided with an aperture 14 through which numbers or legends written or'printed uponthe paper ribbon 15 are visible. The face 13 is'braced to the bearings 11' by braces such as 16 andthe rollerf17' revolubly mounted in the'link 18 which ishinged to saidfface presses the rib 301115 uponthe drum 10. The weight of the roller 17 and link 18 may be'suificient to-press' the ribbon 15 upon the drum 10 or a suitable spring may be employed to increasethe pressure, if desired.

" post 19' is mounted in the base 12and alink 20] is pivoted to said post. A roller 21 is revolubly mounted in the end of the link 20 and the spring 22 presses said roller against the ribbon 15.

A worm wheel 23 is secured to the drum 10 and meshes with the worm 24. The

worm 24 is secured upon one end of the shaft 25 and the latter is revolubly mounted in thebearings26 and 27, which are'secured to the base 12. The worm 24 presses against one face of the bearing 26 and the collar 28 bearing against the other faces prevents end motion of the worm 24. j n An escapement wheel 29 and a collar 30 are secured to the shaft 25 The spring 31 is secured at one end to the collar 30 and has its other end secured :to the pin 32' mounted in the gear33. The gear 33 meshes with the pinion 34..and the latter is fixed upon the armatureshaft 35 of the .motor 36. The motor 36 is connected in series with a rheos'tat to any; approved source of electricity and the motor is preferably series wound and of'comparatively high resistance.

An eccentric 37 is secured upon the shaft 25 and the eccentric strap'38 is mounted upon said eccentric and secured to the piston rod 39 Which, slides in bearings provided in thefends of the, air cylinder 40. The piston 41 ismounted upon the piston rod 39 and the'cylind'ei' 40 has an oscillatory motion about the pivot screws 42-42 which are secured to the undersideof. the

base 12. A post 43 is mounted upon the 7 base 12 and has near'its top a square hole in which is slidably mounted the push rod 44 which has on one end the pawl 45 and on the other the armature 46. A spring 47 serves. normally to keep the pawl 45in the position shown in Fig. 4. The pawl 45 has a tooth 48 and an anvil 49. The magnet 50 is secured to the post 51 and the latter is supported by the base 12.

A guard 51 for supporting the ribbon 15 is held in place by the bracket 51 and the latter may be secured to the base 12 or to the bearings 26 and 27.

The circuit closer for use with my improved exhibitor comprises a base, supporting bearings 52-52 in which are revolubly mounted the pintles of any plurality of contact wheels such as 53, each of which comprises a metallic wheel having any desired plurality of teeth such as 54 between which are secured insulating strips such as 55. The wheels 53 are all mounted upon one shaft and are allrevolved at the same annular speed by the worm wheel 55 the latter being driven by the worm 56 on the shaft of the armature of the motor 57. V

A contact spring 58 is secured in position to make contact with each of the wheels 53 and the spring 59 is mounted upon the slide 60 which slides along the bar 61. The spring- 59 makes contact with the head of the screw 62 that secures the spring 58 in position.

The motor 57 is preferably series wound and is connected in series with a rheostat to a source of electricity so that the speed of the worm 56 may be varied.

The slide 60 is connected by the wire 63 to one terminal of the magnet 50 and the other terminal of said magnet is connected to one pole of the battery 64, the other pole of whicliis connected to one of the bearings 52 and through the latter and the pintle to the wheels 53. A normally open key 65 is connected to the wire 63 and to one of the bearings 52. v

The operation of my improved changeable exhibitor and circuit closer is as follows The motors 36 and 57 are to be started and their speed adjusted to the desired number of revolutions per minute.

When the shaft 35 is revolved the spring 31 is-wound up until its resistance prevents further movement of the armature of the motor 36.

V The slide 60 is to be moved until the spring 59 contacts with the desired screw 62, the corresponding wheel 53 then revolving. When one of the teeth 54 makes contact with the spring 58 the magnet 50 will be energized and the armature 46 will be attracted toward the left, (see Fig. 4). When the armature 46 is drawn towards the left the tooth 48 is removed from the path of the tooth 66 of the escapement wheel 29 and the spring 31 revolves the wheel 29 in the direction of the arrow until the tooth 67 strikes. the anvil 49.- H

The armature 46 is held adjacent the magnet '50 as long as thetooth 54 makes contact with the spring. 58, but when said tooth Numbers or combinations of numbers are placed upon the ribbon 15 and are so located that when each toothis in contact with the anvil 49, they will be exhibited through the aperture 14; consequently, by varying the relative peripheral lengths of the teeth 54 and the insulating strips 55, the numbers, combinations of numbers or legends may be caused to appear through the aperture 14 for definite periods of time and when it is desired to change this period, this may be done by either varying the potential at the terminals of the motor 57 or by sliding the spring 59 into contact with one of the screws 62.

For special purposes the contact spring 59 may be placed where it may make contact with none of the screws 62 and then the operation of the magnet 50 may be controlled by the key 65. lVhen the key is pressed down, the armature 46 will be drawn toward the left by the magnet 50 and when the key 65 is released the spring 47 will move the armature 46 towards the right bringing about the same cycle of operations as hereinbefore described. I As the shaft 25 revolves the spring 31 unwinds and resistance to the movementofthe armature of the motor 36 will diminish until it reaches a point where the armature again revolves and winds up the spring 31. It is to be noted that the shaft 25, pawl 67 and worm wheel 24' are to be made comparatively light and mounted so that they will revolve very freely. As a consequence of this construction, inertia of these parts is reduced to a minimum and the spring 31 may revolve the shaft 25 without appreciable time lag. s p

I find, however, that for the cushioning of the blows when the teeth of the wheel 29 strike either the tooth 48 or anvil 49, it is desirable to use the eccentric 37 piston 41 and cylinder 40 because fheresistance of the J air on either side of said piston affords but slight resistance to the beginning of the movement of the shaft 25, but the compression of the air relieves the force of said blows.

While I have shown one embodiment of my invention for purposes of illustration, it is to be understood that many changes may be made therein, such, for instance, as

theplacing of a pointer 69 uponthe pintle 70 and the placing of a dial such as 71 adjacent said ointer, without departing from the spirit 0? my invention.

Furthermore, the worm wheel 55, worm 56 and motor 57 may be omitted and the pintle of the wheels 53 may be a prolongation of the shaft of the drum 10 without departing from the spirit of my invention.

I claim 1. In a changeable exhibitor, the com-' bination with means for exhibiting signals and mechanism for operating said means, of a spring secured at one end to said mechanism for moving said mechanism, a source of power for moving the other end of said spring and a magnet for controlling'the movements of said mechanism, said source of power continuously applying a force to said last named end greater than the force of said spring.

2. In a changeable exhibitor, the combination with means for exhibiting signals and mechanism for operating said means, of a spring secured at one end to said mechanism for moving said mechanism, a source of power for moving the other end of said spring, a magnet for controlling the movements of said mechanism, a plurality of contact wheels having contact teeth differing in number, springs bearing on said wheels, a source of electricity and an electric circuit including said magnet and wheels and a slide for connecting any one of said springs in said circuit.

3. In a changeable exhibitor, the combination with means for exhibiting signals and mechanism for operating said means, of a spring secured at one end to said mechanism for moving said mechanism, a source of power for moving the other end of said spring, a magnet for controlling the movecircuit including said magnet and wheels and a slide for connecting any one of said sprin s in said circuit.

4. In a changeable exhibitor, the combination with means for exhibiting signals and mechanism for operating said means, of a spring secured at one end to said mechanism for moving said mechanism, a continuously acting source of power for moving the other end of said'spring, a magnet for controlling the movements of said mechanism, a contact wheel moved by said source of power, a spring bearing upon said wheel, a source of electricity an an electric circuit including said magnet, wheel, spring and source.

5. In a changeable exhibitor, the combination with a shaft, a spring having one end secured to said shaft and a continuously acting source of power for moving'the other end of said spring, of an escapement wheel mounted on said shaft, a pawl for controlling the movement of said wheel, means for exhibiting signals moved by said shaft, a magnet for moving said pawl, a source of electricity, an electric circuit including said magnet and source and means for opening and closing said circuit.

In testimony whereof I afiix my signature.

' MYRICK W. PULLEN. 

